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CVE-2026-48558— SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification

Quick assessment

Affected
SimpleHelp SimpleHelp
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SimpleHelp是SimpleHelp公司的一款功能强大的远程支持和远程访问软件。 SimpleHelp 5.5.15及之前版本和6.0 RC2版本存在加密问题漏洞，该漏洞源于OIDC身份验证流中存在身份验证绕过问题，登录时提交的身份令牌未验证加密签名，可能导致远程未认证的攻击者提交包含任意身份声明的伪造令牌，获取完全认证的技术人员会话。

CVSS 10.0 · Critical KEV EPSS 5.72% · P93

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
SimpleHelp SimpleHelp 5.5.0< 5.5.16 affected
6.0< 6.0 RC2 affected
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I. Basic Information for CVE-2026-48558

Vulnerability Information
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Vulnerability Title
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
Source: CVE Program / CVE List V5
Vulnerability Description
SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying their cryptographic signature. In a vulnerable configuration, a remote, unauthenticated attacker can submit a forged token containing arbitrary identity claims to obtain a fully authenticated technician session. In some configurations, this may also allow bypass of multi-factor authentication. No user interaction is required.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
SimpleHelp 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SimpleHelp是SimpleHelp公司的一款功能强大的远程支持和远程访问软件。 SimpleHelp 5.5.15及之前版本和6.0 RC2版本存在加密问题漏洞，该漏洞源于OIDC身份验证流中存在身份验证绕过问题，登录时提交的身份令牌未验证加密签名，可能导致远程未认证的攻击者提交包含任意身份声明的伪造令牌，获取完全认证的技术人员会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SimpleHelp SimpleHelp 5.5.0 ~ 5.5.16 -

II. Public POCs for CVE-2026-48558

# POC Description Source Link Shenlong Link
1 SimpleHelp <= 5.5.15 and 6.0 pre-release contain an authentication bypass caused by lack of cryptographic signature verification in OIDC tokens, letting remote unauthenticated attackers gain technician sessions, exploit requires OIDC authentication configured. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-48558.yaml POC Details
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III. Intelligence Information for CVE-2026-48558

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Vendor Advisories for CVE-2026-48558 (1)

Security Blog Posts for CVE-2026-48558 (1)

Vendor Pages for CVE-2026-48558 (1)

IV. Related Vulnerabilities

Same product: SimpleHelp
Same vendor: SimpleHelp
Same weakness: CWE-347

V. Comments for CVE-2026-48558

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